Interim work on audio import and processing.
Merge branch 'develop3d' of https://github.com/mono/MonoGame into pipeline
Added content building classes.
Added solution for windows content pipeline.
Added project for the MonoGame Content Builder command line tool.
First pass at parsing the .contentproj and executing the build.
WIP for pipeline.
* Added XML documentation to several classes.
Merge branch 'develop3d' of https://github.com/mono/MonoGame into pipeline
We better handle exceptions in content processing.
PipelineManager expects absolute assembly paths now.
We now use the XNAGSv4 environment variable to resolve XNA assemblies.
We now try to load assemblies from the GAC if possible.
The output folder name is now specified on the command line.
Merge branch 'develop3d' of https://github.com/mono/MonoGame into pipeline
Merge branch 'develop3d' of https://github.com/mono/MonoGame into develop3d
Merge branch 'develop3d' of https://github.com/mono/MonoGame into develop3d
Merge branch 'develop3d' into pipeline
Merge branch 'mgcb' of https://github.com/SickheadGames/MonoGame into pipeline
Set IsMouseVisible to true by default as like in WindowsGL version. (https://github.com/mono/MonoGame/pull/837 - #c45d69c)
Fixed SetPosition for windesktop so that it correctly position with PointToScreen.
Provided additional information in (re)thrown exceptions.
Merge pull request #1177 from Qbit86/develop3d

Provided additional information in (re)thrown exceptions.
Added stubs for ResourceCreatedEventArgs and ResourceDestroyedEventArgs. Not used yet.
Added DIRECTX11_1 conditional to Windows 8 project.
Fixed GamePad to support DirectX 11 and 11.1.
Added new conditionals WINDOWS_MEDIA_ENGINE (Win8), WINDOWS_MEDIA_SESSION (Win7/Vista).
Started to add MediaSession implementation to MediaPlayer.